Greg,
You are right, there is also TrinusVR which can track your head as well – wirelessly. The smartphone isn’t powerful enough (PCs GPU I understand are taxed with Kinect) but you have given me some ideas in combination with your driver and a computer/mobile interface on how to be more free. Again, the goal being that one can move to a larger space if their “computer office” doesn’t have enough.
I do appreciate your time in discussing this! Awesome project!